IllIG
Model DQ409
FLOPPY DISC CONTROLLER
DEC LSI·11 COMPATIBLE
FEATURES
• Single dual wide printed circuit board with Shugart interface.
• On·board bootstrap with jumper selectable address for booting RX02 compatible diskettes.
• Compatible with RX02 (DY) software drivers in RT·11 and RSX·11.
• RX01, RX02 media compatible.
• IBM 3740 format.
• Controls one or two single or dual density flexible diskette drives with Shugart 800 or 850 compatibility.
• Jumper selectable 4 level interrupt.
• DMA data transfer.
• On·board formatting capability.
• Write precompensation.
• Automatic power fail/power down protection.
• Memory addressing to 128K words.
• Automatic self·test feature with built·in microdiagnostics and status indicator.
·DEC and RSX are registered trademarks of Digital Equipment Corporation
DESCRIPTION
The Distributed Logic Corporation (DILOG) Model D0409 emulating floppy disc controller couples up to two Shugart SA800 or 850 equivalent floppy disc drives to LSI·11 (O· BUS) based computer systems.
The controller is compatible with all LSI·11 , 11/2 and 11/23 based configurations.
The Model D0409 controller is microprocessor based, and implemented on a single dual wide board , which plugs into and requires one dual wide slot in an LSI·11 based backplane .
On·board firmware provides such features as auto·
matic self·test, write current control , and power fail protect.
A complete disc subsystem is comprised of the controller, one or two floppy disc drives and the necessary interconnecting ribbon cables.
No specially wired connectors, additional chassis, power supplies or bus converters are required. The single , dual printed circuit module contains all necessary disc controller interface and formatting circuitry.
DISTRIBUTED LOCiIC [ORP.
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WRITE PRECOMPENSATION
The Model D0409 is designed to compensate for a time dis·
placement phenomenon that occurs after the writing of certain bit patterns on the magnetic media. This compensation is required for all flopy disc drives, and designed into the D0409 to increase the performance level of your floppy disc subsystem.
For additional information, refer to Shugart Associates Applica·
tion Bulletin - "SA800 Series Diskette Storage Drive Double Density Design Guide:'
WRITE CURRENT CONTROL
The Model D0409 provides the appropriate circuitry to reduce the write current for tracks greater than 43.
HARDWARE BOOTSTRAP
The Model D0409 contains an on·board bootstrap loader to auto·
matically boot double density diskettes. On·board jumpers allow you to disable bootstrap for booting from the standard DEC bootboard, or selection of an alternate bootstrap address.
DATA FORMATTING
The Model D0409 contains on·board circuitry to allow for the formatting and verification of sector headers, in addition to the writing of the data field in the user selected density.
LOW POWER CONSUMPTION
With its single board architecture and extensive use of Low Power Shottky circuitry, the Model D0409 exhibits up to 60% less power consumption than other DEC compatible floppy diskette controllers.
FULL SYSTEM SUPPORT
Distributed Logic Corporation also supplies fully integrated and tested disc subsystems, including the disc drives themselves.
For the customer that wishes to purchase drives directly from the manufacturer, they can be drop·shipped to our facility where they will be integrated, tested and shipped as a complete system with the Model D0409.
DOCUMENTATION
Each Model D0409 is supplied with an Instruction Manual.
OPTIONS
Disc drive 1/0 cables • Disc Drives • Factory integration of customer·supplied drives.
DISC DRIVES SUPPORTED
SHUGART REMEX PERTEC BASF MICROPOLIS PER SCI, INC.
TAN DON MAGNETIC CORP.
QUMECORP.
CONTROLLER SPECIFICATIONS
Mechanical- The Model D0409 is completely contained in one dual module 5.22 inches wide by 8.88 inches deep, and plugs into one dual slot in any DEC LSI·11 based system backplane. Computer 1/0 Register Addresses
- Command and status register 777170 - Data buffer register 777172
Data Transfer - Method: DMA Bus Load
-1 std unit load Address Ranges
- Disc drive: up to one mebabyte total - Computer memory: to 128K words Interrupt Vector Address
- Factory set at 264, priority level BR4 Disc Drive 110
- 50 pin type "A" flat ribbon cable connector mounted on outer edge of controller module.
Signal- Shugart 800 compatible Power-+ 5 volts at 2.5 amps
Environment - Operating temperature 40°F. To 140°F., humidity 10 to 95% non·condensing.
Shipping Weight - 5 pounds, includes documentation and cables.
tSpecifications subject to change without notice.
D 15TR I BUTED LOE; U: [ORP.
111111111111111111 12800-G Garden Grove Blvd.
Garden Grove, CA 92643 Phone (714) 534-8950 Telex 681 399 OILOG GGVE
PRINTED IN U.S.A. 6181
